1271645860 has 12 divisors (see below), whose sum is σ = 2670456348. Its totient is φ = 508658336.

The previous prime is 1271645831. The next prime is 1271645861. The reversal of 1271645860 is 685461721.

It can be written as a sum of positive squares in 2 ways, for example, as 250715556 + 1020930304 = 15834^2 + 31952^2 .

It is not an unprimeable number, because it can be changed into a prime (1271645861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31791127 + ... + 31791166.

It is an arithmetic number, because the mean of its divisors is an integer number (222538029).

Almost surely, 2^1271645860 is an apocalyptic number.

1271645860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1271645860 is an abundant number, since it is smaller than the sum of its proper divisors (1398810488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1271645860 is a wasteful number, since it uses less digits than its factorization.

1271645860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63582302 (or 63582300 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 1271645860 is about 35660.1438583750. The cubic root of 1271645860 is about 1083.3997405183.

The spelling of 1271645860 in words is "one billion, two hundred seventy-one million, six hundred forty-five thousand, eight hundred sixty".